haller



c. T. HALLER.

MUFFLER,

APPUCATION FILED FEB.16| I918.

Patented July 8, 1919.

ATT).

- both uurrnn STATES PAT ET oEEIoE.

our. 'rnimE HELLER, or sMoGEN, SWEDEN, ASSIGNOR To LAUBENCIUS LAURIN MANAGING DIRECTOR, or LYSEKIL, SWEDEN.

MUFFLER.

Specification of Letters Patent.

Patented July 8; 1919.

Application filed February 16, 1918. Serial No. 217,731.

have invented certain new and useful Improvements in Mufilers, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an apparatus for eifecting a uniform and noiseless discharging of an intermittently running gas. The said apparatus is suitable especially as silencer of internal combustion engines but may be used for'instance for eflectirig a uniformdischarging of the steam pu s from locomotives andthe like.

In the acompanying drawing Figure 1 is an end view of an apparatus arranged in accordance with this invention. Fig. 2 is a longitudinal section on the line IIII of Fig. 1. I

According to the present invention the apparatus consists of a cylinder 1 closed at ends and provided with a tangential inlet 2 for the gas at its one end and with a tan ential outlet 3 at the opposite end. The

- sai cylinder'l is provided at its inner side with a helical flange l, inside which a cylinder 5 is located bearing against the inner edge of the said flange, so that a helical channel 6 is efii'ected, which extends from the inlet 2 to the outlet 3. The said channel communicates with the interior of the cylinder through openings 7, whichlmay consist of a helical slot 7 as shown in Fig. 2. The said helical slot is used in silencers for motors driven by a soot depositing fuel for instance paraflin or crude oil, in order to render possible the provision of a device for cleaning the slot 7 from soot now and then. In the drawing the said device consists of a shaft 8 'journaled in the center parts of the end walls of the-cylinder 1 and provided at its one end with a crank 9. A rod 10 or the like is mounted on the said shaft in a slidable manner, the ends of which extend into the helical slot 7 -The shaft 8 is ri'er 11, which, as the s aft is rotated, bears against the rod 10 and causes it to rotate with the shaft. Owin to the engagement of the rod 10 with the s 0t 7 the rod is moved along the slot and reciprocated on the shaft dependent on the direction, in which the shaft is rotated, thus removing soot from the slot.

rovided with a car- The described apparatus operates in-the following manner. Asa quantity of compressed gas for instance the exhaust gas of an internal combustion engine, passes into the cylinder 1 or the helical channel 2 at a great velocity it tends to expand instantaneously owing to the great difference of pressure and consequently to effect a cracking sound. Owing to the fact, however, that the gas passes at great velocity through the long channel 4 and past the narrow slot. 7 or the openings provided in the inner cylinder 5,

the said gas will enter the cylinder 5, so that the increasing of the pressure in the latter is as uniform as possible. As the discharging of the gas from the engine is then suddenly interrupted, the gas, locatedin the cylinder 5 and rotating in the same, flows outward through the slot 7 of the cylinder 5 due to the difl'erence of pressure and the centrifugal force and thus prevents the generating of a sound effecting vacuum in the discharge pipe of the engine.

Owing to the centrifugal force of the gas mass rotating in the cylinder 5 a considerable vacuum is created in the said cylinder between the pufi's of the gas, which vacuum will be useful durin the next pufl. Besides a useful suction is e ected in the cylinder of the engine at the end of each discharge.

Having now described my invention, what I claim as new and desire to secure by Lety ters Patent is:

1. In an apparatus for effecting a uniform and hoi'seless discharging of an intermittently running gas the combination of a cylinder closed at its ends, tangential inlet and outlet at the ends of the said cylinder, a helical flange provided at the inner side of the cylinder, an inner cylinder, bearing against the inner edge of the said flange, and an opening provided in the cylinder last mentioned and connecting thesame with the helical channel inclosed by the said cylinders, substantially as described and shown in the accompanying drawing. 7

2. In an apparatus for eflecting a uniform and noiseless discharging of an intermittently running gas the combination of a cylinder closed at its ends, tangential inlet and outlet, at the ends of the said cylinder, a helical flange providedat the inner side of the cylinder, an inner cylinder bearing against the edge of the said flange and a helical slot provided in the cylinder last mentioned and connecting the "same with the helical channel inclosed by the said cylinders, substantially as described and shown in the accompanying drawing.

3. In an apparatus for effecting a uniform and noiseless discharging of an intermittently running gas the combination of a cylinder closed at its ends, tangential inlet and outlet at the ends of the said cylinder, a helical flange provided at the inner side of the cylinder, an inner cylinder bearing against the inner edge of the said flange, a helical slot provided in the cylinder last mentioned and connecting the same with the helical channel inclosed by the said cylinders, a central shaft journaled in the ap a ratus, and a rod slidably but not rotata ly connected with the said shaft, and engaging the said slot, substantially as described and for the purpose set forth.

4. In an apparatus for effecting a uniform and noiseless discharging of an intermittently running gas the combination of a cylinder closed at its ends, tangential inlet and outlet at the ends of the said cylinder, a helical flange provided at the inner side of the cylinder, an inner cylinder bearing against the edge of the said flange, a helical slot provided in the cylinder last mentioned and connecting the same with the helical channel inclosed by the said cylinders, a central shaft journaled in the apparatus, a carrier fixed to the said shaft, and a free rod engaging the said helical slot and acted upon by the said carrier, substantially as described and for the purpose set forth.

5. In an apparatus for efl'eoting a uniform and noiseless discharging of an intermittently flowing gas, a continuous helical conduit for the gas, means closing the space within the helix, and means of communica tion between the conduit and the said space.

6. In an apparatus for effecting a uniform and noiseless discharging of an intermittently flowing gas, a continuous helical conduit for the gas, and means closing the space Within the helix, the said conduit having a helical slot affording communication with the said space for the greater part of its length.

7. In an apparatus for effecting a uniform. and noiseless discharging of an intermittently flowing gas, a continuous helical conduit for the gas, means closing the space Within the helix, the said conduit having a helical slot affording communication with the said space for the greater part of its length, a shaft mounted axially of the helix,-

and a rod mounted on said shaft for rotation therewith, the ends of said rod engaging the slot, said rodbeing free for axial movement upon said shaft.

In witness whereof I have hereunto signed my name.

CARL TH-URE HALLER. 

